MarkItDown test for sample-receipt.pdf

Input: sample-receipt.pdf

uv run markitdown "sample-receipt.pdf" -o "sample-receipt--markitdown-python.md"

--keep-data-uris: retains embedded images as base64 data URIs instead of truncating them, a meaningfully different (much larger) output.

uv run markitdown "sample-receipt.pdf" -o "sample-receipt--markitdown-python--keep-data-uris.md" --keep-data-uris